If you own a home built in the 1970s, 1980s, or early 1990s, there is one type of plumbing you should know about: Quest plumbing, also commonly spelled Qest plumbing.
Quest pipes are a type of polybutylene plumbing that was installed in millions of homes before it was discontinued. Today, many homeowners searching for polybutylene pipe replacement in Seattle, Bellevue, Tacoma, Everett, and surrounding areas are discovering these pipes are still behind their walls.
The difficult part is that you may not know you have them until you experience a leak, find them during a remodel, have a home inspection, or begin researching your plumbing system.
Here is how to tell whether your home has Quest or polybutylene pipes, why homeowners replace them, and what a whole house PEX repipe involves.
What Is Quest or Qest Plumbing?
Quest, sometimes written as Qest, is a name commonly associated with polybutylene pipe.
Polybutylene was a flexible plastic material used for residential water supply plumbing primarily from the late 1970s through the mid-1990s.
At the time, it was considered an affordable and convenient alternative to traditional metal plumbing.
The problem is that polybutylene piping can deteriorate over time.
Because much of that deterioration can happen from the inside, the plumbing may appear normal from the outside even as the material is weakening.
That is why homeowners with older plumbing often search for Quest pipe replacement or polybutylene pipe replacement before a major failure occurs.
How Can I Tell If My House Has Polybutylene Pipes?
One of the most recognizable signs of polybutylene plumbing is flexible gray piping.
Depending on the manufacturer and installation, the pipe may also appear blue, black, or another muted color.
Another important identifier is the marking PB2110 printed on the pipe.
Visible plumbing near a water heater, crawl space, basement, utility area, or underneath sinks can sometimes help identify the material.
However, do not assume that newer-looking plumbing in one part of your home means the entire plumbing system has been replaced.
It is common for older homes to contain a mixture of plumbing materials because sections were repaired or remodeled over the years.
A repipe specialist can inspect the plumbing and determine whether polybutylene or Quest piping is still being used throughout the home.
Why Is Polybutylene Plumbing a Concern?
Polybutylene pipe can weaken as it ages.
Unlike a plumbing problem that occurs at one fitting or fixture, aging polybutylene can be a system-wide issue because the same material may be installed throughout the entire house.
A homeowner may repair one leaking section while other sections of the original plumbing remain behind walls, underneath floors, or inside crawl spaces.
That is one reason polybutylene pipe replacement is often handled as a whole-home project rather than a series of individual plumbing repairs.
If the piping throughout the house is made from the same aging material, replacing only one section does not address the condition of the remaining plumbing.
Should You Replace Quest Pipes Even If They Are Not Leaking?
This is one of the most common questions homeowners have.
A pipe does not necessarily need to be actively leaking for you to investigate what type of plumbing is in your home.
If you discover Quest, Qest, or polybutylene pipes, it is worth having the system evaluated so you understand what is behind your walls and what your replacement options are.
This can be especially important if you are planning to stay in the home long term, preparing for a remodel, buying or selling a home, or have already experienced plumbing problems.
Waiting for a major leak means the decision may eventually have to be made during an emergency.
Having the plumbing inspected ahead of time allows you to understand the scope and cost of a potential whole house repipe before that happens.
What Is Polybutylene Replaced With?
One of the most common materials used for modern residential repiping is PEX plumbing.
PEX is flexible, corrosion-resistant and well suited for routing new water lines throughout an existing home.
At Red Cedar Repipe, we use high-quality REHAU PEX for our whole-home repiping projects.
Rather than repeatedly repairing sections of outdated plumbing, a PEX repipe replaces the old water supply system with modern piping throughout the home.
For homeowners researching Quest pipe replacement, polybutylene replacement, PEX repiping, or whole house repiping in Seattle, this is usually the type of project they are considering.
What Happens During a Whole House Repipe?
A whole house repipe sounds like an enormous construction project, but specialized repiping is different from standard plumbing work.
At Red Cedar Repipe, repiping is our specialty.
Our team first identifies the existing plumbing and determines the best routes for the new water lines. Strategic access points are created where necessary so the new PEX can be installed throughout the house.
Once the new plumbing system is installed, it is pressure-tested and checked carefully before the job is completed.
Because our crews specialize specifically in repiping, most Red Cedar Repipe projects can be completed in a single day.
That means homeowners can replace an aging plumbing system without turning the project into weeks of construction.
Quest Pipes vs. PEX Plumbing
Homeowners researching old plumbing frequently come across both polybutylene and PEX, and because both can be flexible plastic piping, they sometimes assume they are the same material.
They are not.
Polybutylene is the older material commonly associated with Quest or Qest plumbing.
PEX is a modern cross-linked polyethylene plumbing material now widely used for residential water supply systems.
If you see flexible plumbing in your home and are unsure whether you have polybutylene or PEX, look for pipe markings or have the plumbing inspected before making assumptions.
Identifying the material correctly is the first step in determining whether your home needs pipe replacement or repiping.
Polybutylene Pipes in Seattle-Area Homes
Homes throughout Western Washington were built during the years when polybutylene plumbing was commonly installed.
That means homeowners in Seattle, Bellevue, Everett, Tacoma, Kirkland, Redmond, Issaquah, Renton, Sammamish, Bothell, Woodinville, Puyallup, Gig Harbor, and surrounding communities may still encounter Quest or polybutylene plumbing today.
If your home was built or significantly plumbed between the late 1970s and mid-1990s, finding out what type of water lines you have is worthwhile.
You do not need to wait until water is coming through the ceiling to start asking questions about your plumbing.
Buying a House With Quest or Polybutylene Pipes?
If polybutylene pipes are identified during a home inspection, find out how much of the plumbing system is affected.
A home may have a few remaining sections of older pipe, or the majority of the original water supply system may still be polybutylene.
Before moving forward, understanding the scope of the plumbing can help you determine what a complete polybutylene repipe would involve.
The same applies if you are preparing to sell an older home.
Knowing the type and condition of your plumbing before it becomes an issue during an inspection can help you plan ahead.
Need Polybutylene Pipe Replacement in Seattle?
If you have found gray Quest pipes, Qest plumbing, PB2110 markings, or another type of outdated plumbing in your home, Red Cedar Repipe can help you determine what you are dealing with.
We specialize in whole house repiping and polybutylene pipe replacement throughout Seattle and Western Washington.
With more than 5,000 repipes completed, our team focuses specifically on replacing aging and failing residential plumbing systems quickly and professionally.
We provide free estimates, clear pricing, financing options, and an efficient repiping process designed to minimize disruption to your home.
If you are searching for a polybutylene repipe, Quest pipe replacement, PEX repipe, repipe specialist, or whole house repipe in Seattle, contact Red Cedar Repipe to schedule a free estimate.
Low water pressure can turn everyday tasks like taking a shower, washing dishes, or running the washing machine into a frustrating experience. And if the water pressure throughout your entire house seems to be getting worse, the problem may be bigger than a clogged showerhead or faulty faucet.
For homeowners in Seattle—especially those living in older homes—low water pressure can be a sign that the plumbing pipes themselves are reaching the end of their useful life.
If you’re experiencing weak water pressure in multiple areas of your home, here’s what could be happening and when it may be time to consider a whole-house repipe.